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<TITLE>Int 4B/AX=8102h/DX=0000h
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Int 4B/AX=8102h/DX=0000h - Virtual DMA Specification (VDS) - GET VERSION -
AX = 8102h
DX = 0000h
Return: CF clear if successful
AH = major version number
AL = minor version number
BX = product number (see #03217)
CX = product revision number
always 0000h for QMAPS and HPMM.SYS
always 0001h for Microsoft's EMM386.EXE v4.20-4.41
DX = flags (see #03219)
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<h2>Int 4B/AX=8102h/DX=0000h
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<h3><font color=#C00040>Virtual DMA Specification (VDS) - GET VERSION</font></h3>
<PRE>
AX = 8102h
DX = 0000h<br>
<p><b>Return:</b><br>CF clear if successful
AH = major version number
AL = minor version number
BX = product number <a href="rb-6262.htm#Table3217" tppabs="http://www.ctyme.com/intr/rb-6262.htm#Table3217">(see #03217)</a>
CX = product revision number
always 0000h for QMAPS and HPMM.SYS
always 0001h for Microsoft's EMM386.EXE v4.20-4.41
DX = flags <a href="rb-6262.htm#Table3219" tppabs="http://www.ctyme.com/intr/rb-6262.htm#Table3219">(see #03219)</a>
SI:DI = maximum DMA buffer size
CF set on error
AL = error code <a href="rb-6262.htm#Table3218" tppabs="http://www.ctyme.com/intr/rb-6262.htm#Table3218">(see #03218)</a>
</PRE>
<p><b>Note:</b>
Bit 5 of 0040h:007Bh is supposed to be set if VDS is supported; this is
apparently not always the case
<p><b>See Also:</b>
<a href="rb-4202.htm" tppabs="http://www.ctyme.com/intr/rb-4202.htm">INT 2C/AX=002Bh</a> - <a href="rb-5838.htm" tppabs="http://www.ctyme.com/intr/rb-5838.htm">INT 31/AX=0400h</a> - <a href="int-4b-1.htm" tppabs="http://www.ctyme.com/intr/int-4B.htm">MEM 0040h:007Bh</a>"4Bh"
<PRE>
<p><b>Index:</b><br>Installation check;Virtual DMA Specification
<p>
<a name=table3217></a>
(Table 03217)
Values for VDS product number:
0000h for Quadtel's QMAPS and Hewlett-Packard's HPMM.SYS
0001h for Microsoft's EMM386.EXE
0003h for Windows 3.x WIN386.EXE
0300h OS/2 (all versions to date)
0EDCh for DR DOS 6.0 EMM386.SYS
4560h ("E`") for Qualitas' 386MAX
4D43h ("MC") for V Communications' Memory Commander
5145h ("QE") for Quarterdeck's QEMM-386
524Dh ("RM") for Helix's Netroom RM386
<p>
<a name=table3218></a>
(Table 03218)
Values for VDS error code:
01h region not in contiguous memory
02h region crossed a physical alignment boundary
03h unable to lock pages
04h no buffer available
05h region too large for buffer
06h buffer currently in use
07h invalid memory region
08h region was not locked
09h number of physical pages greater than table length
0Ah invalid buffer ID
0Bh copy out of buffer range
0Ch invalid DMA channel number
0Dh disable count overflow
0Eh disable count underflow
0Fh function not supported
10h reserved flag bits set in DX
<p>
Bitfields for VDS flags:
<a name=table3219></a>
Bit(s) Description (Table 03219)
0 PC/XT bus (DMA in first megabyte only)
1 physical buffer/remap region in first megabyte
2 automatic remap enabled
3 all memory is physically contiguous
4-15 reserved (zero)
</PRE>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
Disk I/O Enhancements</a>
- <a href="int-4b-1.htm" tppabs="http://www.ctyme.com/intr/int-4B.htm">
Int 4Bh</a>
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